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WINDSOR, ENGLAND - MARCH 24: Queen Elizabeth II and Prince Philip, Duke of Edinburgh attend the traditional Royal Maundy Service at Windsor Castle on March 24, 2016 in Windsor, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

WINDSOR, ENGLAND - MARCH 24:  Queen Elizabeth II and Prince Philip, Duke of Edinburgh attend the traditional Royal Maundy Service at Windsor Castle on March 24, 2016 in Windsor, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)

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WINDSOR, ENGLAND - MARCH 24: Queen Elizabeth II and Prince Philip, Duke of Edinburgh attend the traditional Royal Maundy Service at Windsor Castle on March 24, 2016 in Windsor, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

WINDSOR, ENGLAND - MARCH 24:  Queen Elizabeth II and Prince Philip, Duke of Edinburgh attend the traditional Royal Maundy Service at Windsor Castle on March 24, 2016 in Windsor, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)